Agilent Technologies 6800 Series, Product Note

Page 1: ...C Power Source Analyzers for Generation and Measurement Applications Simulating AC Line Sub Cycle Dropouts Generating MIL STD 704D Waveforms Performing IEC 555 2 Measurements Performing Inrush Current Measurements Generating User Defined Waveforms Operating the Agilent 6812A and 6813A at Low Frequencies ...

Page 2: ... These are the capabilities that are discussed and a description of how they can be applied Table of Contents Introduction to the Agilent 6800 AC Power Source Analyzer Agilent 6800 Series Output Transients Agilent 6800 Series Triggering Agilent 6800 Series Measurements Application 1 Simulating AC Line Sub Cycle Dropouts Application 2 Generating MIL STD 704D Waveforms Application 3 Performing IEC 5...

Page 3: ...lysis of voltage and current wave forms providing amplitude and phase up to the 50th harmonic total harmonic distortion triggered acquisition of digitized voltage and current The 6800 series can be used in bench or ATE appli cations The fully featured front panel and built in GPIB and RS 232 interfaces allow you to program waveforms measure parameters and monitor the status of the ac power source ...

Page 4: ...s The num ber of successive output settings is in part what differentiates one transient mode from another What is a STEP Transient A Step transient generates a single triggered out put change from an immediate output level to ONE successive output level of one or more of the output parameters subject to transient control Only output parameters programmed to Step mode will be part of the triggered...

Page 5: ...5 Model of the Transient System ...

Page 6: ...e delay can be specified for triggers that generate output changes This allows the insertion of a specified time delay between the receipt of the trigger and the action of the ac power source analyzer output What Can Serve as the Source of the Trigger The 6800 series can receive triggers from the following sources The GPIB The computer can send trigger commands to the ac power source analyzer Ther...

Page 7: ...7 Output Transient Trigger Model Measurement Trigger Model ...

Page 8: ...ta buffers Upon completing the acquisition of 4096 data points for voltage and current the unit then performs the required calculation to return the requested measurement parameter When a new acquisition of instantaneous output voltage and current data is desired this command should be used to return the requested measurement What is a FETCh Command This command allows the user to retrieve meas ur...

Page 9: ... at 25 microsecond increments The acquisition of voltage and current data can also be initiated relative to the acquisition trigger thereby enabling the capture of pre event and post event data To capture pre event or post event voltage and current data the offset of data points relative to the trigger is programmed The range of offset that can be programmed is from 4096 to 2xl09 points If the off...

Page 10: ...s on the application if applicable The following table lists the 6800 series features used in each of the applications Applications Application 1 2 3 4 5 6 Transient Generation Step mode Pulse mode List mode Transient generation with a trigger delay Synchronization with output phase User defined waveform generation Voltage slew control Frequency slew control Measurement and Analysis Synchronizatio...

Page 11: ...ansient capability the computer is not devoted to sequencing the output By using the trigger delay it is assured that the power supply is in steadystate operation One command initiates the test Implementation details How the 6800 series implements the dropout The computer sends a trigger to the ac power source analyzer with a programmable delay of 5 seconds to ensure that the ac input to the power...

Page 12: ...te full cycle dropouts 2 The Pulse count can be set to a value 1 and the Pulse period can be programmed to 0 01667 seconds the period of a 60 Hz sinewave to create multiple dropouts 3 The triggered level of the rms voltage can be set higher than the initial setting of 120 Vrms to simulate a voltage surge 4 The rms voltage slew rate can be programmed in Pulse mode to simulate a gradual brown out sa...

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Page 14: ...voltage and frequency tran sients will be executed as an integrated test sequence Agilent 6800 series features used RMS voltage and frequency control in List mode RMS voltage slew control List dwell time control Triggering system to execute the List Advantages benefits of the Agilent 6800 series solution The List capability allows the ac power source analyzer outputs to sequence through each RMS v...

Page 15: ...hen the ac input to the equipment under test is set to the nominal levels prior to the onset of the next transient The length of time the output of the ac power source analyzer is set to the nominal level can be determined by user convenience 60 seconds for this example Set the transient trigger source to BUS Initiate the transient trigger Enable the output of the ac power source analyzer Send a b...

Page 16: ...16 List Timing Diagram for Application 2 ...

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Page 18: ...pability to return measured current amplitude data up to the 40th harmonic of the fundamental Agilent 6800 series features used RMS Voltage and frequency control Measurement window control Harmonic current measurement Advantages benefits of the Agilent 6800 series The 6800 series provides a One Box Solution so a separate power analyzer is not required for quasi stationary harmonic measurements The...

Page 19: ...z Set the measurement window to Rectangular Enable the output of the ac power source analyzer Wait until the ac input to the equipment is in a steadystate condition Send the harmonic current array measurement command to return 50 harmonic current amplitudes Using the computer Read the harmonic current array into the computer Compare the measured harmonic current ampli tudes of harmonic numbers 2 t...

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Page 21: ...utput voltage phase Measurement and waveform generation synchronization High crest factor Advantages benefits of the Agilent 6800 series solution The 6800 series provides a One Box Solution for measurement and waveform generation and elimi nates the worry of synchronizing separate instru ments The ability to turn on relative to the output voltage phase allows worst case inrush characteri zation wh...

Page 22: ...r Initiate the transient trigger Initiate the acquisition trigger Send a Bus trigger Fetch the peak current measurement Upon receipt of the trigger the ac power source analyzer output goes to 120 Vrms when the phase voltage waveform reaches 40 The data buffer acquires 409 instantaneous current data points before the turn on event and 3687 instantaneous current data points beginning at the onset of...

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Page 24: ...ser defined arbitrary waveform creation storage rms voltage programming Frequency programming Waveform shape transient generation List transient mode Advantages benefits of the Agilent 6800 series solution The user defined waveform is stored in non volatile memory eliminating the need for con stant re creation and making it easy to recall the waveform as the test is needed A List of out put wavefo...

Page 25: ...e Dwell Time 1 Sine 120 s 2 CLASS1 120 s 3 Sine 120 s Set the List to sequence automatically Set the transient trigger source to BUS Initiate the transient trigger Enable the output Send a Bus trigger Upon receipt of the trigger the first List step is executed and the output is set to a 120 Vrms 60 Hz sinewave After 120 seconds the ac power source analyzer automatically executes the second List st...

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Page 28: ...ogrammable measurement sample rate pro vides high accuracy measurements for low frequency signals Use of the FETCh command provides fast measurements from the same data buffers x10 current measurement range increases the accuracy for low current and low power measurements Implementation details How the 6812A and 6813A generate low frequency ac waveforms and perform low frequency ac measurements A ...

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